Thanks for your help but i have applied all these
for exaple in model i have applied "Required" attribute to year filed.
for example : code
<select asp-for="Year">
<option selected value=""></option>
<option value="2015">2015</option>
<option value="2014">2014</option>
</select>
<span asp-validation-for="Year"></span>
Other fields validation are working fine but for select item it is not working at all. Dont you think that we need to pass data source from c# then only it will work. hmm?
can you give me a live example ?